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Abstract
Gram-negative bacteria and their endotoxins may be a causal or complicating factor in many serious diseases. Bacterial lipopolysaccharides (LPS) could potentially be human pathogens. Among the many disorders induced by LPS, neurodegenerative diseases such as Parkinson’s are reported and are of great interest. Despite the evidence on LPS-induced neurodegeneration, the exact mechanism is unknown. The purpose of this study was to investigate the cytotoxic effect of LPS and also to examine the involvement of Bax, pro-apoptotic, Bcl-2, anti-apoptotic, and caspase-3, the executioner of apoptosis, protein expression, during LPS-induced apoptosis in neuronal PC12 cells. The cell viability was evaluated by MTT assy. The expression of pro-apoptotic Bax and anti-apoptotic Bcl2 and caspase -3 protein expressions were measured by immunoblotting. The results showed that LPS could reduce cell viability after 72 h in a dose-dependent manner which was statistically significant in concentration of 200 µg/ml. In western blotting analysis, LPS (200 µg/ml) also enhanced expression of pro-apoptotic Bax and pro-caspase-3 proteins compared to controls, while the expression of Bcl-2 protein was not changed significantly. The Bax/Bcl-2 ratio was significantly increased in LPS-treated cells compared to controls. From the present results, it might be concluded that LPS can cause PC12 cell death, in which apoptosis plays an important role, possibly by the mitochondrial pathway through higher expression of the Bax as well as caspase 3 protein.